# SPDX-License-Identifier: GPL-2.0 # LEX# ---------------------------------------------------------------------------quiet_cmd_flex = LEX     $@      cmd_flex = $(LEX) -o$@ -L $< $(obj)/%.lex.c: $(src)/%.l FORCE	$(call if_changed,flex) # YACC# ---------------------------------------------------------------------------quiet_cmd_bison = YACC    $(basename $@).[ch]      cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $< $(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE	$(call if_changed,bison) # ==========================================================================# Building binaries on the host system# Binaries are used during the compilation of the kernel, for example# to preprocess a data file.## Both C and C++ are supported, but preferred language is C for such utilities.# Rust is also supported, but it may only be used in scenarios where a Rust# toolchain is required to be available (e.g. when  `CONFIG_RUST` is enabled).## Sample syntax (see Documentation/kbuild/makefiles.rst for reference)# hostprogs := bin2hex# Will compile bin2hex.c and create an executable named bin2hex## hostprogs     := lxdialog# lxdialog-objs := checklist.o lxdialog.o# Will compile lxdialog.c and checklist.c, and then link the executable# lxdialog, based on checklist.o and lxdialog.o## hostprogs       := qconf# qconf-cxxobjs   := qconf.o# qconf-objs      := menu.o# Will compile qconf as a C++ program, and menu as a C program.# They are linked as C++ code to the executable qconf## hostprogs   := target# target-rust := y# Will compile `target` as a Rust program, using `target.rs` as the crate root.# The crate may consist of several source files. # C code# Executables compiled from a single .c filehost-csingle	:= $(foreach m,$(hostprogs), \			$(if $($(m)-objs)$($(m)-cxxobjs)$($(m)-rust),,$(m))) # C executables linked based on several .o fileshost-cmulti	:= $(foreach m,$(hostprogs),\		   $(if $($(m)-cxxobjs)$($(m)-rust),,$(if $($(m)-objs),$(m)))) # Object (.o) files compiled from .c fileshost-cobjs	:= $(sort $(foreach m,$(hostprogs),$($(m)-objs))) # C++ code# C++ executables compiled from at least one .cc file# and zero or more .c fileshost-cxxmulti	:= $(foreach m,$(hostprogs),$(if $($(m)-cxxobjs),$(m))) # C++ Object (.o) files compiled from .cc fileshost-cxxobjs	:= $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) # Rust code# Executables compiled from a single Rust crate (which may consist of# one or more .rs files)host-rust	:= $(foreach m,$(hostprogs),$(if $($(m)-rust),$(m))) host-csingle	:= $(addprefix $(obj)/,$(host-csingle))host-cmulti	:= $(addprefix $(obj)/,$(host-cmulti))host-cobjs	:= $(addprefix $(obj)/,$(host-cobjs))host-cxxmulti	:= $(addprefix $(obj)/,$(host-cxxmulti))host-cxxobjs	:= $(addprefix $(obj)/,$(host-cxxobjs))host-rust	:= $(addprefix $(obj)/,$(host-rust)) ###### Handle options to gcc. Support building with separate output directory hostc_flags    = -Wp,-MMD,$(depfile) \                 $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \                 $(HOSTCFLAGS_$(target-stem).o)hostcxx_flags  = -Wp,-MMD,$(depfile) \                 $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \                 $(HOSTCXXFLAGS_$(target-stem).o) # `--out-dir` is required to avoid temporaries being created by `rustc` in the# current working directory, which may be not accessible in the out-of-tree# modules case.hostrust_flags = --out-dir $(dir $@) --emit=dep-info=$(depfile) \                 $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \                 $(HOSTRUSTFLAGS_$(target-stem)) # $(objtree)/$(obj) for including generated headers from checkin source filesifeq ($(KBUILD_EXTMOD),)ifdef building_out_of_srctreehostc_flags   += -I $(objtree)/$(obj)hostcxx_flags += -I $(objtree)/$(obj)endifendif ###### Compile programs on the host # Create executable from a single .c file# host-csingle -> Executablequiet_cmd_host-csingle 	= HOSTCC  $@      cmd_host-csingle	= $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \		$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))$(host-csingle): $(obj)/%: $(src)/%.c FORCE	$(call if_changed_dep,host-csingle) # Link an executable based on list of .o files, all plain c# host-cmulti -> executablequiet_cmd_host-cmulti	= HOSTLD  $@      cmd_host-cmulti	= $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \			  $(addprefix $(obj)/, $($(target-stem)-objs)) \			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))$(host-cmulti): FORCE	$(call if_changed,host-cmulti)$(call multi_depend, $(host-cmulti), , -objs) # Create .o file from a single .c file# host-cobjs -> .oquiet_cmd_host-cobjs	= HOSTCC  $@      cmd_host-cobjs	= $(HOSTCC) $(hostc_flags) -c -o $@ $<$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE	$(call if_changed_dep,host-cobjs) # Link an executable based on list of .o files, a mixture of .c and .cc# host-cxxmulti -> executablequiet_cmd_host-cxxmulti	= HOSTLD  $@      cmd_host-cxxmulti	= $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \			  $(foreach o,objs cxxobjs,\			  $(addprefix $(obj)/, $($(target-stem)-$(o)))) \			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))$(host-cxxmulti): FORCE	$(call if_changed,host-cxxmulti)$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) # Create .o file from a single .cc (C++) filequiet_cmd_host-cxxobjs	= HOSTCXX $@      cmd_host-cxxobjs	= $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE	$(call if_changed_dep,host-cxxobjs) # Create executable from a single Rust crate (which may consist of# one or more `.rs` files)# host-rust -> Executablequiet_cmd_host-rust	= HOSTRUSTC $@      cmd_host-rust	= \	$(HOSTRUSTC) $(hostrust_flags) --emit=link=$@ $<$(host-rust): $(obj)/%: $(src)/%.rs FORCE	$(call if_changed_dep,host-rust) targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \	   $(host-cxxmulti) $(host-cxxobjs) $(host-rust)